Leica D Vario-Elmarit 14-50 mm f/2.8-3.5 Asph. Mega O.I.S.
8. Vignetting
Passing to the concrete values we can say that at 14 mm and by f/2.8 the light fall-off in the frame corners amounted to 28% (-0.95 EV). On stopping down the aperture by one stop it decreased to 16%. By f/5.6 it was 12% and by f/8 it decreased to an imperceptible level of 10%.
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At 25 mm and by f/3.3 the vignetting increased to 22%(-0.72 EV) and on stopping down to f/4.0 it decreased to 18%. Only using f/5.6 made it imperceptibly low – 10%.
At 50 mm the situation looked similar. By f/3.5 the brightness loss in the frame corners we measured as 24% (-0.86 EV), by f/4.0 it amounted to 21% and by f/5.6 – to only 8%.